<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0"/>
    <title>互联网</title>
    <style>
        *,html{
            margin: 0;
            padding: 0;
        }
        img{
            max-width: 720px;
            width: 100%;
            margin: 0 auto;
            display: block;
        }
    </style>
</head>
<body>
    <img src="image/index.png" alt="互联网"/>

</body>
</html>